Published: December 18, 2010

WASHINGTON — The Senate on Saturday struck down the ban on gay men and lesbians serving openly in the military, bringing to a close a 17-year struggle over a policy that forced thousands of Americans from the ranks and caused others to keep secret their sexual orientation.

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Timeline: Congressional Action on ‘Don’t Ask, Don’t Tell’

By a vote of 65 to 31, with eight Republicans joining Democrats, the Senate approved and sent to President Obama a repeal of the Clinton-era law, known as “don’t ask, don’t tell,” a policy critics said amounted to government-sanctioned discrimination that treated gay and lesbian troops as second-class citizens.

Mr. Obama hailed the action, which fulfills his pledge to reverse the ban. “As commander in chief, I am also absolutely convinced that making this change will only underscore the professionalism of our troops as the best led and best trained fighting force the world has ever known,” Mr. Obama said in a statement after the Senate, on a 63-33 vote, beat back Republican efforts to block a final vote on the repeal bill.

The vote marked a historic moment that some equated with the end of racial segregation in the military.

It followed a comprehensive review by the Pentagon that found a low risk to military effectiveness despite greater concerns among some combat units and the Marine Corps. The review also found that Pentagon officials supported Congressional repeal as a better alternative than an court-ordered end.

Supporters of the repeal said it was long past time to end what they saw as an ill-advised practice that cost valuable personnel and forced troops to lie to serve their country.

“We righted a wrong,” said Senator Joseph I. Lieberman, the independent from Connecticut who led the effort to end the ban. “Today we’ve done justice.”

Before voting on the repeal, the Senate blocked a bill that would have created a path to citizenship for certain illegal immigrants who came to the United States at a young age, completed two years of college or military service and met other requirements including passing a criminal background check.

The 55-41 vote in favor of the citizenship bill was five votes short of the number needed to clear the way for final passage of what is known as the Dream Act. The outcome effectively kills it for this year, and its fate beyond that is uncertain since Republicans who will assume control of the House in January oppose the measure and are unlikely to bring it to a vote.

The Senate then moved on to the military legislation, engaging in an emotional back and forth over the merits of the measure as advocates for repeal watched from galleries crowded with people interested in the fate of both the military and immigration measures. “I don’t care who you love,” Senator Ron Wyden, Democrat of Oregon, said as the debate opened. “If you love this country enough to risk your life for it, you shouldn’t have to hide who you are.”

Mr. Wyden showed up for the Senate vote despite saying earlier that he would be unable to do so because he would be undergoing final tests before his scheduled surgery for prostate cancer on Monday.

The vote came in the final days of the 111th Congress as Democrats sought to force through a final few priorities before they turn over control of the House of Representatives to the Republicans in January and see their clout in the Senate diminished.

It represented a significant victory for the White House, Congressional advocates of lifting the ban and activists who have pushed for years to end the Pentagon policy created in 1993 under the Clinton administration as a compromise effort to end the practice of banning gay men and lesbians entirely from military service. Saying it represented an emotional moment for members of the gay community nationwide, activists who supported repeal of “don’t ask, don’t tell” exchanged hugs outside the Senate chamber after the vote.

“Today’s vote means gay and lesbian service members posted all around the world can stand taller knowing that ‘don’t ask, don’t tell’ will soon be coming to an end,” said Aubrey Sarvis, an Army veteran and executive director for Servicemembers Legal Defense Network.

The executive director of the Log Cabin Republicans, a gay group that challenged the policy in federal court, thanked Republicans senators for participating in a historic vote. The director, R. Clarke Cooper, who is a member of the Army Reserve, said repeal will "finally end a policy which has burdened our armed services for far too long, depriving our nation of the talent, training and hard won battle experience of thousands of patriotic Americans. "

A federal judge had ruled the policy unconstitutionial in response to the Log Cabin suit, but that decision had been stayed pending appeal.